I have added to my TODO list to support Unicode Collation Algorithm (UCA). Hopefully this will be available in the next release of Everything.

While this is not pinyin, it might be 'good enough'.
Implementing Pinyin at this stage will be unfeasible. The sorting rules are too complex, I can't use third party sorting or the Windows API to sort as these could change at any time and it is critical the Everything database is sorted in a specific way.

I also have concerns about UCA as storing these collation lookup tables will require quite a bit of data.. (128K+)
There is also a small performance hit with adding collation lookup tables.